package client;

import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.SocketChannel;
import java.nio.charset.Charset;
import java.util.Iterator;
import java.util.Set;

public class ClientThread implements Runnable {
    private Selector selector;
    public ClientThread(Selector selector){
        this.selector = selector;
    }
    @Override
    public void run() {
        try {
            for(;;) {
                //获取channel数量
                int readChannels = selector.select();
                if (readChannels == 0) {
                    continue;
                }
                //获取可用的channt
                Set<SelectionKey> selectionKeys = selector.selectedKeys();
                //遍历集合
                Iterator<SelectionKey> iterator = selectionKeys.iterator();
                while (iterator.hasNext()) {
                    SelectionKey selectionKey = iterator.next();
                    iterator.remove();
                    if (selectionKey.isReadable()) {
                        readOperator(selector, selectionKey);
                    }

                }
            }
        }catch (Exception e){

        }
    }
    private void readOperator(Selector selector, SelectionKey selectionKey) throws IOException {
        //从SelectionKey获取到已经就绪的通道
        SocketChannel socketChannel = (SocketChannel) selectionKey.channel();
        //创建buffer
        ByteBuffer byteBuffer = ByteBuffer.allocate(1024);
        //循环读取客户端消息
        int readLength = socketChannel.read(byteBuffer);
        String message = "";
        if (readLength >0){
            //切换读模式
            byteBuffer.flip();
            //读取内容
            message += Charset.forName("UTF-8").decode(byteBuffer);
        }
        //将channel再次注册到选择器上，监听可读状态
        socketChannel.register(selector,SelectionKey.OP_READ);
        //把客户端发送消息，广播到其他客户端
        if(message.length()>0){
            System.out.println(message);
        }
    }
}
